Win32/UWP build

Enable SpecializationConstants feature for webgpu, Populate PipelineDesc.constants, Add tests. #4251

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Run time

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Job	Run time
Win10 -> Pre-checks	20s
Win10 -> Win10-Win32, Release	29m 59s
Win10 -> Win10-Win32, Debug	24m 51s
Win10 -> Win10-Dev-x64, RelWithDebInfo	15m 15s
Win10 -> MinGW-x64, Release	14m 17s
Win10 -> UWP-x64, Debug	3m 6s
Win10 -> Win10-x64, Release	32m 29s
Win10 -> Win10-x64, Debug	23m 40s
Win10 -> UWP-x64, Release	3m 39s
Win10 -> Win10-Ninja-x64, Debug	12m 29s
	2h 40m 5s